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Discussion Starter #1 (Edited)
(VIDEO added page three) $800 home built twin turbo setup. The car is my '87 Mustang GT. I picked it up 18 months ago for $1000. It needed a new clutch and a bit of TLC but the odometer showed 127,000 miles which isnt too bad.

I was gonna just pull the trans and replace the clutch, but the engine was very grimy so I figured why not pull it too so I can powerwash it and put some new gaskets in it. I got them out and stripped the 302 to the shortblock, then I figured why not put in a new set of rings and bearings, so I stripped it down bare and sent the crank, block and piston/rod assemblies to my machinist. He honed the cylinders, hammered in a new set of cam bearings and cleaned the bare block. The crank only needed a polish and I had him press in a set of ARP rod bolts.

I get all the pieces home, spend the next 6 weeks assembling the shortblock and TFS heads and top it off with a Parker Funnel Web. I spent 20 hours doing a bowl blend with the twisted wedge heads and port matching the funnel web intake with the TFS runners. The cam is a TFS stage 1, it specs out at 221/225 dur @ .050" and .499"/.510" lift in/ex with a 1.6 roller rocker. As far as the motor goes its really nothing special, just a heads/cam upgrade with a carb conversion. The compression ratio is still 9.3:1 and the Holley is an old 650 DP that I converted to run as a blow thru.

Now the fun stuff! The Blowthru Setup
The headers are home-made, they consist of some SB header flanges that I chopped off the original shortys, all the tubing from the flanges to the 3 1/2" collector is 1 5/8" mandrel bent. I bought a DIY weld up kit that came with a box of 1 5/8" bends, the funny part is the kit was for a small block Chevy and priced at $89 minus SBC header flanges. I reduced the 3 1/2" collector down to 2 1/2" and ran that to the T-3 flanges.

The turbos are cheap ebay .63/.50 A/R Ford turbo coupe knock-offs, they usually sell for $150-$200 apiece. The twin 38mm wastegates are $60 apiece ebay specials. BOV is a $40 you guessed it (ebay).

The charge pipe is another homemade piece consisting or 2 1/2" mandrel bent mild steel tubing, the two pipes meet and merge into a 4" tube that feeds into the 4" carb bonnet.











 

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Re: Homebuilt budget twin turbo pics

Cool home build, keep us posted on how it runs.
 

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Re: Homebuilt budget twin turbo pics

You should be running in the 9-10's easily. You have a roll bar yet??? :):):). Great build up. Like the blue powdercoating you did. Put up a video of it running. Great job!!
 

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Discussion Starter #7
Re: Homebuilt budget twin turbo pics

Im glad you guys like it. Its not running yet but Im very close and I will be taking video.
 

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Re: Homebuilt budget twin turbo pics

I only have 1/8th mile tracks in my area and they are much more leniant about the 7.50 roll bar rule. If it breaks into the 6s then they will probably limit me to 330' runs. Yeah no roll bar yet but its high on the priority list once this thing is running. Over the winter I welded in new floors and subframe connectors as well as reinforced torque boxes.
 

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Re: Homebuilt budget twin turbo pics

Nice clutch replacement... ;) I'd get some water injection on there or a tank of race gas before pushing it too hard. Those Chinese knockoff turbos are not as efficient and blow some pretty hot air. They'll do a fairly good job, but you'll have a tougher time with anti-knock than real Garretts. You may also need to add some restrictors to the oil feed lines so they don't push oil past the shaft rings and into the compressor. You'll know if you need them... lol.

David
 

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Discussion Starter #11
Re: Homebuilt budget twin turbo pics

Nice clutch replacement... ;) I'd get some water injection on there or a tank of race gas before pushing it too hard. Those Chinese knockoff turbos are not as efficient and blow some pretty hot air. They'll do a fairly good job, but you'll have a tougher time with anti-knock than real Garretts. You may also need to add some restrictors to the oil feed lines so they don't push oil past the shaft rings and into the compressor. You'll know if you need them... lol.

David
AIS has a meth/water injection kit that I am very interested in and its not too bad at $270. I will be running a 50/50
mix of pump gas and C16 for track use no matter what. The oil feed flange that I used has a .090" restrictor hole so hopefully it keeps me from burning too much oil. The clutch replacement part is pretty funny! That was all I intended to do and look how far that went, I didnt even replace the clutch! I'd make a terrible mechanic lol.
 

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Re: Homebuilt budget twin turbo pics

Cool! Here are some other guys that do that stuff. Well, they used to more than they do now... toohighpsi.com
Mike, that guy and his buddies were my original inspiration for building a turbo car. I remember reading everything on that site back in '03 when those guys had just hung up the towel. Very talented guys and I believe one of them is an engineer somehow tied in with forced induction?? My favorite project of theirs has to be the twin M90 supercharged 351w in the Thunderbird, that thing pulled its tires hard and ran middle 10s.
 

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Very cool and nicely done. Let us know how it runs with the carb. I knew some guys running turbos with a carb, but they had some issues getting the turbos to work properly with a carb. Turbos seem to work better with fuel injection. I hope you get it running awesome:)
 

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Discussion Starter #14
Re: Homebuilt budget twin turbo pics

Very cool and nicely done. Let us know how it runs with the carb. I knew some guys running turbos with a carb, but they had some issues getting the turbos to work properly with a carb. Turbos seem to work better with fuel injection. I hope you get it running awesome:)
Yeah the turbo and carb thing is going to haunt me all summer but I know that people do it so it is possible but probably not the best method.
 

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Re: Homebuilt budget twin turbo pics

are those the SS chrome cheapy turbos from Evilbay?

If so I wouldnt have wasted my money, if they were. those turbos in the ford four banger turbo world are known for being huge pos's.

Good luck though I am a die hard turbo guy and have a turbo setup for my car in mind down the road.
 

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Re: Homebuilt budget twin turbo pics

AIS has a meth/water injection kit that I am very interested in and its not too bad at $270. I will be running a 50/50
mix of pump gas and C16 for track use no matter what. The oil feed flange that I used has a .090" restrictor hole so hopefully it keeps me from burning too much oil.
Cool. If you want to make your own WI system, I have a slick and cheap (but very reliable and effective) method I'm finishing a Tech article on. If running 50/50 pump and C16 (about 103 octane), you should be okay without it but I would still run it for other benefits. The .090" restrictors should do. Sounds like it's coming together well!

BTW - the import turbos are primarily made by three different companies and each has their own issues. In each case though, they seem to do fine if used at lower boost levels (OEM or generally <10-12psig) and are sized properly so they don't ever exceed their lower critical shaft RPM. Most of the online crowd that has issue with them (besides their country of origin) are because they are pushing them hard into a range they become both grossly inefficient and unreliable.

Yes, they're both cheap and inexpensive, but for a modest street car, they have pretty good dollar value. Of course, if you get a bad one or over-spin it and shatter a compressor into the engine, the value drops substantially. :rolleyes: I feel the best overall dollar value is factory remanufactured big name units.

David
 

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Discussion Starter #17
Re: Homebuilt budget twin turbo pics

are those the SS chrome cheapy turbos from Evilbay?

If so I wouldnt have wasted my money, if they were. those turbos in the ford four banger turbo world are known for being huge pos's.

Good luck though I am a die hard turbo guy and have a turbo setup for my car in mind down the road.
No these turbos are not chrome, the turbine housing is cast iron and the compressor housing is aluminum. I actually have some low mileage factory Garret turbo coupe turbos and after taking apart both turbos, the finish machine work is just as good with the ebay turbos. There are plenty of people pushing these turbos into the 10s season after season without reliability problems. Their secret is not to overspin them, keep the boost within reason and run big twin 38mm wastegates to keep boost under control. It shouldnt take alot of boost to push a Twisted Wedge headed 302 into the 500+ hp range.
 

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Discussion Starter #18
Re: Homebuilt budget twin turbo pics

PSIG, I am definately interested in reading your article!
 

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Re: Homebuilt budget twin turbo pics

No these turbos are not chrome, the turbine housing is cast iron and the compressor housing is aluminum. I actually have some low mileage factory Garret turbo coupe turbos and after taking apart both turbos, the finish machine work is just as good with the ebay turbos. There are plenty of people pushing these turbos into the 10s season after season without reliability problems. Their secret is not to overspin them, keep the boost within reason and run big twin 38mm wastegates to keep boost under control. It shouldnt take alot of boost to push a Twisted Wedge headed 302 into the 500+ hp range.
not asking if the housing is chrome Im asking if the seller on ebay was SS chrome lol. Theres quite a few DIY h2o injection ideas on the internet. I cant find the one I copied on natomessageboard anymore but it used a stock 88lph fuel pump and a nozzle from mcmaster carr.
 

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Discussion Starter #20
Here is a few shots of the downpipe. The tubing was sourced from a 2 1/2" mandrel U-bend from summit. The flange is a standard T3 5-bolt bought from ebay and it came with a gasket and bolts. Notice that its only 10" long and exits downward out of the front inner fender. This should help greatly in spooling these turbos faster with zero back pressure.
 
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